Generally, divorce is immoral, but not always. This is why the Catechism gives example when it is “tolerated” in 2383, already cited. Like most things.
This woman doesn’t have to divorce her husband. What she needs to do is separate from him till such time their marriage can be consecrated in the Church. Had she done that, her sinful condition would have stopped and she would have received her absolution.
Oh?
Just what SIN is she ACCUSED of?
Thank GOD the pesky y/n requirement is missing here!